<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
<style type="text/css">
@media only screen and (min-width:0px) and (max-width:768px) {
	body {
		background-color: red;
	}
}
@media only screen and (min-width:768px) and (max-width:992px) {
	body {
		background-color: green;
	}
}
@media only screen and (min-width:992px)  {
	body {
		background-color: yellow;
	}
}
</style>
</head>
<body>
</body>
</html>